#3 It would allow someone to be very creative
One of the main appeals of Wyatt, The Fiend, and the Firefly Fun House is that it is unlike anything else currently in pro wrestling. Wyatt is having a ball while crafting everything around this character. It was also so successful right away that fans rejected the face Champion Seth Rollins when the two battled in a Hell in a Cell match.
Instead of just cutting a promo or wrestling a match, Wyatt takes us through his history through sometimes jaded means. We saw a big part of that in the FF match with John Cena. That offering was perhaps the most Creative thing that WWE has ever produced. It pulled back the veil behind not only the business but some personal feelings that some stars and fans also have regarding who gets pushed and how history would have been different.
There are many creative minds in wrestling and ones that get to utilize that creativity often enjoy their jobs more. With an outlet, people can express feelings in any situation instead of just being mad at an opponent. Wyatt has used therapy painting, cooking, working out and other means to express his feelings. We've also seen glimpses into his fractured psyche that is protected by the Fiend. I'm sure WWE has many creative female stars. We just don't get to see how creative beyond nicknames and named moves. By allowing a female performer to delve into some darker tendencies, we'd get a different take on the business.